THE INFLUENCE of SOLID SURFACE ENERGETICS ON MACROMOLECULAR ADSORPTION FROM MILK

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Abstract
Four materials characterized by their differing values of solid surface tension were implanted into different locations within the tube wall of a shell and tube heat exchanger. the implants were subjected to milk flowing at temperatures from the ambient to the ultra-high temperature (UHT) range (150°C) for contact times varying from 1 to 30 min. After contact the implanted materials were removed for surface film analysis by ellipsometry and internal reflectance infrared spectroscopy. Deposition rates of the molecular subfractions first adsorbed appear to be strongly dependent upon physical properties of the bare surface. Macromolecular deposition rates were described with Arrhenius kinetic expressions in which Ea, the apparent activiation energy required for the transformation, is dependent on the surface temperature and the deviation of the solid surface tension from some value evoking minimal biological adhesion.